AN INVESTIGATION ON THE WEED FLORA OF TAIHU AGRICULTURAL AREA OF JIANGSU PROVINCE

More than 1400 sampling plots of 151 sites distributed throughout 13 counties "were surveyed, 88 families, 301 genera and 555 species ( including 15 varieties ) were recorded and sampled.The vicious and main weed species in the Various crop fields and habitates -were determined by the frequencies and dominances of weeds.The results showed that the main features of the weed flora of Taihu agricultural area were as follows; abundant and widely spreaded in species; highly diversified in family and genera; remarkable geographical characteristics of middle and lower Yangtze River valley; dominant anual lifeform; large proportion of hydrophyte and hygrophyte; obvious companionate with crops; sensitive to the environmental factors both ecofo-gical and cultivational.